[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/google.golang.org/protobuf/internal/detrand/rand.go b/vendor/google.golang.org/protobuf/internal/detrand/rand.go
new file mode 100644
index 0000000..49c8676
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/internal/detrand/rand.go
@@ -0,0 +1,69 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package detrand provides deterministically random functionality.
+//
+// The pseudo-randomness of these functions is seeded by the program binary
+// itself and guarantees that the output does not change within a program,
+// while ensuring that the output is unstable across different builds.
+package detrand
+
+import (
+ "encoding/binary"
+ "hash/fnv"
+ "os"
+)
+
+// Disable disables detrand such that all functions returns the zero value.
+// This function is not concurrent-safe and must be called during program init.
+func Disable() {
+ randSeed = 0
+}
+
+// Bool returns a deterministically random boolean.
+func Bool() bool {
+ return randSeed%2 == 1
+}
+
+// Intn returns a deterministically random integer between 0 and n-1, inclusive.
+func Intn(n int) int {
+ if n <= 0 {
+ panic("must be positive")
+ }
+ return int(randSeed % uint64(n))
+}
+
+// randSeed is a best-effort at an approximate hash of the Go binary.
+var randSeed = binaryHash()
+
+func binaryHash() uint64 {
+ // Open the Go binary.
+ s, err := os.Executable()
+ if err != nil {
+ return 0
+ }
+ f, err := os.Open(s)
+ if err != nil {
+ return 0
+ }
+ defer f.Close()
+
+ // Hash the size and several samples of the Go binary.
+ const numSamples = 8
+ var buf [64]byte
+ h := fnv.New64()
+ fi, err := f.Stat()
+ if err != nil {
+ return 0
+ }
+ binary.LittleEndian.PutUint64(buf[:8], uint64(fi.Size()))
+ h.Write(buf[:8])
+ for i := int64(0); i < numSamples; i++ {
+ if _, err := f.ReadAt(buf[:], i*fi.Size()/numSamples); err != nil {
+ return 0
+ }
+ h.Write(buf[:])
+ }
+ return h.Sum64()
+}